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Abstract

Newer electronic private automatic branch exchange (PABX) switching systems (ESS) have features and functions that are usually lacking on previously available PABXs. Of these new features, one of the most important is the ability to automatically forward or transfer an unanswered call to a second phone or to a voice message center.

Country

United States

Language

English (United States)

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Unanswered Call Diverter

Newer electronic private automatic branch exchange (PABX) switching
systems (ESS) have features and functions that are usually lacking on previously
available PABXs. Of these new features, one of the most important is the ability
to automatically forward or transfer an unanswered call to a second phone or to a
voice message center.

The call diverter may be placed in series with the station (telephone) line and
used to detect the lack of answer and cause a switching action to a voice
message center or desired second telephone.

This is one of the most usable features for voice store and
forward applications, such as the automatic voice message system
shown in Fig. 1A. The system includes a PABX 1, a call diverter 2,
and a telephone set 3. A small circuit (Fig. 2B) is introduced in
the call diverter 2 in series with the telephone set 3. The circuit
detects and counts the ringing impulses by use of circuit blocks 5-8.

The impulses are a low frequency AC signal (nominally 20 Hertz) at a
level of about 100 volts, and are on for 2 seconds and off for 4
seconds. After a selected number of ring signals, a driver circuit 9
activates a relay 10 to enable the call to be forwarded to the voice
message system, thereby allowing the caller to leave a message.

The call diverter can supply the CALLED number to the voice message
system by special tones or by other special signals on an input port. This
enhances the system and allows it to respond with a per...